Depth of field (DOF) refers to the range of distance in front and behind an element that appears acceptably sharp. To give an example, imagine that we want to focus on a tree but not on other elements of the environment, such as the house behind, the grass on the ground, the swimming pool, and other elements. In real world, with the correct combination of lens and aperture, it is possible to focus only on the tree and all the other elements will be out of focus. Lumion has a fantastic DOF effect very close to a real camera.